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Rihanna received a ton of happy birthday wishes from families, fans and celebrity friends including her estrange ex-boyfriend Chris Brown.

The two are rumored to be collaborating on her upcoming single “Birthday Cake” remix.

“We got the Rihanna ‘Birthday Cake’ coming out in a week,” confirms producer Kosine over the Grammy weekend. “It’s gonna be crazy,” his production partner, Tuo, said shaking his head.

“And the feature on there is gonna shock the world,” Kosine chimed in cryptically. So would Da Internz offer up even a hint at the identity of this jaw-dropping guest feature? “Nope, nope, not gonna be on my watch,” Kosine said smiling but tight-lipped. “All I’m gonna say is stay tuned — it’s dropping [this] week”. Tuo added that fans should also expect a clip for what stands to be an explosive track. “The visual has to go with it because everybody’s going to be like, ‘Oh my god!’

The two ex lovers has been subliminally tweeting each other on Twitter since last year but today they broke that chain.